How green is your state?

Yes, Kansas. And it's largely due to all that wind power rolling off the plains.

That's according to this recent green ranking of states from MPHOline.org, a website that provides information on a variety of public health topics.

Ranking "greenness" is an inherently difficult task. Graphic creators Infographicworld used figures from the green product rating site GoodGuide for air and water quality data, info from Wikipedia on the number of mass transit systems in each state, and state agencies for information on the other categories.

Washington, D.C., took the top spot for transit systems and air quality, while Delaware won for lowest gasoline usage and carbon dioxide emissions. Alaska has the cleanest water, and Californians recycle the most.

Steve Hargreaves is a senior writer covering economic, energy and environmental issues at CNNMoney. Previously, he worked out of Istanbul and Bangkok, and has been published in the Village Voice and the Australian Financial Review. He tweets at @HargreavesCNN